The very existence of libraries affords the best evidence that we may yet have hope for the future of man

The line treats libraries as more than storehouses of books: they are civic institutions that embody a long view of human life. To build and maintain a library requires confidence that knowledge is worth preserving, that future readers will exist, and that dialogue across generations matters. In that sense, a library is a material sign of trust—trust in education, in shared culture, and in the possibility of moral and intellectual improvement. The quote also implies a contrast with forces of destruction or forgetfulness (war, censorship, cultural amnesia): as long as societies keep founding and using libraries, there remains evidence that humanity has not abandoned hope in reasoned continuity.